Very likely:

https://support.apple.com/en-us/HT208351

They allow a Chinese company to manage iCloud data.

It's clearly 100%.

What about the infamous browser attack publicized by Google’s project zero that seemed to be perpetrated by the Chinese government in order to target the Uighur Muslims? If true that would seem to imply the CCP did not in fact have backdoors already right?

It was targeting the Diaspora, which was using non-China models.

Ah, interesting, "Diaspora" meaning Uighurs outside of China? In that case though, what evidence is there that it was geographically targeted? My understanding was that the attack apparently focused on websites likely to be visited by Uighurs, so how would we know what the geographical target was?

The targeted websites are blocked in China. They are only accessible outside of China.

Thanks for clarifying, I didn’t realize that!